Eureka, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Eureka, a city in Woodford County, Illinois.
Tonight
53°F
Rain then Rain Showers
Rain and a slight chance of thunderstorms before midnight, then rain showers. Mostly cloudy. Low around 53, with temperatures rising to around 59 overnight. South wind 14 to 17 mph, with gusts as high as 28 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
7-day forecast for Eureka
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 53°F | Rain then Rain Showers | 14 to 17 mph S | 96% |
| Wednesday | 59°F | Slight Chance Light Rain then Mostly Cloudy | 16 mph SW | 23% |
| Wednesday Night | 45°F | Mostly Cloudy | 13 mph SW | 5% |
| Thursday | 58°F | Partly Sunny | 9 to 15 mph WSW | 9% |
| Thursday Night | 42°F | Mostly Cloudy then Chance Light Rain | 5 to 8 mph NW | 31% |
| Friday | 54°F | Slight Chance Light Rain | 8 to 12 mph N | 19% |
| Friday Night | 35°F | Partly Cloudy | 2 to 9 mph NNW | 4% |
| Saturday | 53°F | Mostly Sunny | 2 to 6 mph WNW | 3% |
| Saturday Night | 34°F | Partly Cloudy | 3 mph WSW | 3% |
| Sunday | 59°F | Sunny | 3 to 9 mph W | 14% |
| Sunday Night | 35°F | Mostly Clear | 3 to 7 mph W | 5% |
| Monday | 63°F | Sunny | 3 to 12 mph SW | 3% |
| Monday Night | 39°F | Mostly Clear | 5 to 8 mph WSW | 2% |
| Tuesday | 65°F | Sunny | 7 mph WNW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Eureka (40.714, -89.277). Updated through the day.
Growing snapshot for Eureka
Last spring frost
Apr 21
First fall frost
Oct 17
Growing season
178 days
Hardiness zone
5b
More local growing data for Eureka: nearby ZIP 61530 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Benson
Carlock
Congerville
El Paso
Germantown Hills
Goodfield
Lowpoint
Metamora
Minonk
Panola
Roanoke
Secor
Washburn
Climate data from the nearest NOAA station, Congerville 2Nw, Il (6.2 mi from Eureka). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.